please explain this to me step by step so i can make it by myself

QUESTION 5 What would be the lower bound of the 95% confidence prediction interval for the following returns: HINT: First calculate the standard deviation Date Return 11/01/2018 1.1496 11/14/2018 5.59% 12/01/2018 -3.98% 12/14/2018 2.29% NOTE: Enter the PERCENTAGE number rounding to two decimals. If your decimal answer is 0.0 be 3.46. DO NOT USE the % sign